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प्रश्न
Fill in the following blank with a suitable word:
The actual exchange of gases takes place in the ______ of the lungs.
रिक्त स्थान भरें
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उत्तर
The actual exchange of gases takes place in the alveoli of the lungs.
Explanation:
The alveoli are millions of microscopic, thin-walled air sacs wrapped in tiny blood vessels (capillaries). While the rest of the respiratory system serves as a pathway for air to move, the alveoli are the only site where oxygen physically crosses into the blood and carbon dioxide leaves it.
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